<template>
  <div>
    <!--面包屑导航-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>
    <!--卡片视图-->
    <el-card>
      <!--头部警告区域-->
      <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false" show-icon></el-alert>
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <el-cascader
            v-model="selectedCateKeys"
            :options="catelist"
            :props="props"
            @change="handleCateChange" clearable></el-cascader>
        </el-col>
      </el-row>
      <!--页签列表区域-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!--动态参数面板-->
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数
          </el-button>
          <el-table :data="manyTableData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!--循环渲染Tag标签-->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">
                  编辑
                </el-button>
                <el-button type="danger" size="mini" icon="el-icon-delete">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!--静态属性面板-->
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性
          </el-button>
          <el-table :data="onlyTableData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!--循环渲染Tag标签-->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">
                  编辑
                </el-button>
                <el-button type="danger" size="mini" icon="el-icon-delete">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!--添加参数的对话框-->
    <el-dialog
      :title="'添加'+titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <el-form :model="addForm" :rules="rules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
    </el-dialog>
    <!--修改参数的对话框-->
    <el-dialog
      :title="'修改'+titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <el-form :model="editForm" :rules="rules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    name: 'Params',
    data() {
      return {
        catelist: [],
        selectedCateKeys: [],
        props: {
          expandTrigger: 'hover',
          value: 'cat_id',
          label: 'cat_name',
          children: 'children',
          checkStrictly: false
        },
        activeName: 'many',
        //动态参数的数据
        manyTableData: [],
        //静态属性的数据
        onlyTableData: [],
        //控制添加对话框的显示与隐藏
        addDialogVisible: false,
        editDialogVisible: false,
        //添加参数的表单数据对象
        addForm: {
          attr_name: ''
        },
        //添加参数的表单数据对象
        editForm: {
          attr_name: '',
          attr_id: ''
        },
        rules: {
          attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
        },
        //控制按钮与文本框的切换显示
        inputVisible:false,
        //文本框输入的内容
        inputValue:''


      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      //获取所有商品分类的列表
      async getCateList() {
        const { data: res } = await this.$http.get('categories')
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品分类列表失败')
        }
        this.catelist = res.data
        console.log(this.catelist)
      },
      handleCateChange() {
        this.getParamsData()
      },
      //页签点击事件
      handleTabClick() {
        console.log(this.activeName)
        this.getParamsData()
      },
      //获取参数的列表数据
      async getParamsData() {
        //证明选中的不是三级分类；
        if (this.selectedCateKeys.length !== 3) {
          this.selectedCateKeys = []
          //商品分类被强制清空的时候，列表也要清空，避免被恶意编辑
          this.manyTableData=[]
          this.onlyTableData=[]
          return
        }
        console.log(this.selectedCateKeys)
        //根据所选分类的ID和当前所处的面板获取对应的参数列表
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: {
            sel: this.activeName
          }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数列表失败')
        }

        res.data.forEach(item => {

          item.attr_vals=item.attr_vals?item.attr_vals.split(' '):[]

          //控制文本框的显示与隐藏
          item.inputVisible=false
          item.inputValue=''

        })
        console.log(res.data)
        if (this.activeName === 'many') {
          this.manyTableData = res.data
        } else {
          this.onlyTableData = res.data
        }
      },
      //添加对话框的关闭事件
      addDialogClosed() {
        this.$refs.addFormRef.resetFields()
      },
      //编辑对话框的关闭事件
      editDialogClosed() {
        this.$refs.editFormRef.resetFields()
      },
      //点击按钮，添加参数
      addParams() {
        this.$refs.addFormRef.validate(async valid => {
          if (!valid) return
          const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          })
          if (res.meta.status !== 201) {
            return this.$message.error('添加参数失败')
          }
          this.getParamsData()
          this.addDialogVisible = false
        })
      },
      //弹出编辑参数对话框
      async showEditDialog(attr_id) {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
          params: {
            attr_sel: this.activeName
          }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数信息失败')
        }
        this.editForm = res.data
        this.editDialogVisible = true
      },
      //单击按钮，进行编辑
      editParams() {
        this.$refs.editFormRef.validate(async valid => {
          if (!valid) return
          const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          })
          if (res.meta.status !== 200) {
            return this.$message.error('修改失败')
          }
          this.$message.success('修改成功')
          this.getParamsData()
          this.editDialogVisible = false
        })
      },
      //文本框失去焦点，或摁下enter键，会触发该事件
      handleInputConfirm(row){
        if( row.inputValue.trim().length===0){
          row.inputVisible = false;
          row.inputValue = '';
          return
        }
        //输入了实质内容
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue=''
        row.inputVisible=false
        //提交数据库
        this.saveAttrVals(row)

      },
      //将对 attr_vals的操作保存数据库
      async saveAttrVals(row){
        const {data:res}= await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
          attr_name:row.attr_name,
          attr_sel:row.attr_sel,
          attr_vals:row.attr_vals.join(' ')
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改失败')
        }
        this.$message.success('修改成功')
      },
      //显示文本输入框
      showInput(row){
        row.inputVisible=true
        //inputVisible 设置为true后，页面并没有被渲染，所以需要$nextTick
        //让文本框获得焦点
        //$nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定
        //回调函数中的代码
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
      },
      //删除对应的参数和选项
      handleClose(i,row){
        //从数组中删除当前项
        row.attr_vals.splice(i,1)
        //提交数据库
        this.saveAttrVals(row)
      }








    },
    computed: {
      //如果按钮需要被禁用则返回true，否则返回false
      isBtnDisabled() {
        if (this.selectedCateKeys.length !== 3) {
          return true
        }
        return false
      },
      cateId() {
        if (this.selectedCateKeys.length === 3) {
          return this.selectedCateKeys[2]
        }
        return null
      },
      //计算动态标题的文本
      titleText() {
        if (this.activeName === 'many') {
          return '动态参数'
        }
        return '静态属性'
      }
    }
  }
</script>

<style scoped lang="less">
  .cat_opt {
    margin-top: 15px;
  }

  .el-tag {
    margin: 10px;
  }
  .input-new-tag{
    width:120px;
  }
</style>
